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• W4309711013 endingPage "1459" @default.
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• W4309711013 abstract "Supercritical carbon dioxide (SC-CO2) fracturing has been used in developing low permeability and water-sensitive reservoirs in recent years, which is expected to become a new generation of unconventional reservoir fracturing fluid. However, the water-rock interaction characteristics of various lithology shales under SC-CO2 circumstance and its influence on fracturing effect still need to be investigated. Two kinds of shale samples from C7 and S1 formations of the Ordos Basin were treated by SC-CO2 with formation water. The aims of the research are to determine the processes taking place in shale reservoir when considering minerals components transformation, porosity/permeability variation, and micro pore-structure change during the SC-CO2 fracturing. Static and dynamic SC-CO2 immersed experiments were conducted and the scanning of electron microscopy (SEM) and X-ray diffraction (XRD) was employed to analyze the surface morphology and newly formed minerals. Helium porosimeter, the ultralow permeability meter, and the CT scanner are employed to record the alternation of physical parameters during SC-CO2 dynamic injection. The experimental results show that the C7 samples are rich of chlorite and easily reacting with SC-CO2 saturated formation water to form new minerals, but the S1 samples are insensitive to aqueous SC-CO2. The minimum value of permeability and porosity of the C7 cores appear at 24h in the long-interval experiment, but in the short-interval dynamic experiment, the minimum values move ahead to 12h. The optimal flowback time for the C7 reservoir is before 12 h or after 24 h. The high-pressure SC-CO2 flooding pushes the new forming minerals particles to migrate to the outlet side and block the pore throat. For the S1 core results, the porosity and permeability change little in both short and long interval experiments. There is no strict flow-back time requirement for S1 reservoir during SC-CO2 fracturing. This study is significance for the efficient application of SC-CO2 in the exploitation of shale oil reservoirs." @default.
• W4309711013 created "2022-11-29" @default.
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• W4309711013 date "2022-11-18" @default.
• W4309711013 modified "2023-10-16" @default.
• W4309711013 title "Reaction Characteristics of Two Types of Shale with Supercritical CO2 and Its Potential Impact on Flow-Back Strategies" @default.
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• W4309711013 doi "https://doi.org/10.3390/min12111459" @default.
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